Knockout mechanism for heading machines



H. L. SMITH. KNOCKOUT MECHANISM FOR HEADING MACHINES.

APPLICATION FILED AUG.24, 1921. 1,437,919, Patented Dec. 5, 1922.

` 4 SHEETS-SHEET I.

IIII- H. L.. SSMHH.. KNocKouT MEcHANlsM Fo'R HEADING MAGHINES.

APPLICATION FILED AUG.24, 192|- v Patented Dec.V 5, 1922.

4 SHEETS-SHEET 2.

H. L. SMITH.

KNOCKOUT MECHANISM FOR HEADING MACHINES.

APPLICATION FILED AUG.24. I92I.

da. 2. 93 1T H 5H .Q wn 3 DE .dw m y a D1 IIIIIIII lH. L. SMITH. KNOCKOUT MECHANISM yFOR HADING MACHINES.

, APPLIGATION FILED A.UG.24, 19.21.

19212. `4 SHEETS-SHEET 4.

I7 if Patented Dee. 5

IIL-Ir gjzgg Wavre/P ATTO/Ffvfr of the blank and heads that end into the `lorin shown in Fig. 9. The pinch on the dies is then released, the iilling blocks drawn back and the blank pushed out by the knock-out pins as shown in Fig. 10. TheV knock-out pins pass through openings in a slide plate 16 and backing block 1T that are behind the dies in the die pocket. The plate 13 is moved over for pinching the dies by plungers 18 actuated by toggles 19.' Fig. 2. `These toggles are `operated tor the purpose of pinching` and releasing the dies by a. reciprocat-ory slide 2O that is connectedby a link 21 with an angle lever 22 which is rocked by a cam 23 on the cam shaft 24. Figs. 1 and 2.

Further details o1' these mechanisms are not illust-rated and described herein for they are fully set forth in the application previously mentioned and toi-m no part of the present invention7 which relates merely to the construction and action of the knockout mechanism whereby the distance between the shoulder-s 3 on the blank Fig. 11) that is accurately determined when the bla-nk is formed, will always insure an exact distance between the under side of the head 25 and the shoulders 3 of the finished bolt. (Fig. 13.)

The knock-out pins 15 have heads 26 which lie ina horizontal slot 27 in the end of the knock-.out plunger 28. Fig. 2. The knock-out plunger is engaged by the upper end ot a vertical lever 29 pivotally mounted in a bracket 30 fastened to the frame. The lower end of this lever is connected with a block 31 which is adjustably tas-- tened by nuts 32 to the end of a reciprocatory bar 33. The other end of this bar attached to a fork 34 which embraces the cam shaft 24 and has a roll 35 that is engaged by .a cam 36 on the cam shaft. Fig. 1.r .This cam is so timed that at the proper moment the bar is reciprocated, the lever oscillated, the plunger reciprocated an-d the knock-out rods pushed forward to eject a blank from the dies and then returned to position back of the dies.

The outer end of the knock-out plunger is slotted and projecting into the slot is the end of a horizontal lever 3T which is pivotally held in a bracket 3S fastened to the frame. rlhe slot in the plunger into which the lever 37 extends is of sufficient length 1' to permit the plunger to be moved forward` for ejecting a blank without interfering with the action of the lever 37. Fig. 2. The other end otthis lever carries an adjustable screw stud 39 that is. arranged to engage with a central boss 40 on a circular disk 41 which is slidablymounted on four posts 42 that project outwardly Jfrom the bottom ot a cup-shaped cage 43. On the posts 42 and thrusting vbetween the bottom of the cage and the disk are. four springs 44. The

springs push the disk outward and the ends of' the posts `are threaded and provided with adjusting and locking nuts 45 to limit the outward movement of the disk and provide the desired tension for the springs. Two of the posts 42 extend outward further than the other two and are connected by a plate 46 which is fastened to the posts by nuts 47 and is provided with an adjustable screw stud 48 that is engaged with the back of the lever 3'? which the plate spans. Figs. 4 and 5. v

The cage 43 which carries the cushioning springs and disk and that is thus connected. with the lever 37 is slidably mounted on three posts 49. which project from the trame. 1n the back oit' the bottom oit the cage is a= hardened block 50. Fig. 2. ln the front end o'l' the toggle operating slide 2O is an adjustable hardened stud 51 that is screwed into the slide and locked in place by a nut 52. Figs. 2 and 4Q When they slide moves forward to cause the toggle to effect the pinching` together of the dies on a blank, the studV 51 engages the block 50 and pushes the cushioning cage forward sufficientlyY to cause the knock-out pins to press with a yielding force against the ends ot the blank heldin the dies.

lVith this mechanism the ends of the knock-out pins are normally behind the back ifaces ot the dies in such positions that they will not interfere with the action of the dies (Fig. 1') and when the dies are closed together bythe toggle mechanism the toggle .mechanism through the cushioning means pushes the ends ot the pins closely against the'ends ot the blank. Fig. 9. This takes place regardless ol: variations in the length or" the threaded ends of the blanks and the pressure of. the pins assists in sustaining the force of the blow of the punch and relieves the pressure oi the shoulders 3 on the blank against the shoulders 1() in the dies when the blow is struck.4 The spring cushion permits the ends oi the pins to be set firmly against the end of the blank and yet allows a slight yielding under the percussion of the blow ot the punch so that the ends of the pins and the threaded endsI of the blank will not be battered.. After the punch has acted and been withdrawn the pins are pushed orward for ejecting the blank (Fig. 10) with-v out interference by the cushioning mechanism which has held the pins against the ends ot the blank. As a result ot this construction the length of the limbs from the heads to the shoulders at thethreaded ends will be the same in all of the product and the shoulders and threads will not be bruised or marred in any manner thus insuring a uniformly accurate out put tor the machine to which the mechanism is applied.

Theinvention claimed is: i

1. 1n a metal heading machine the combi- Sie nation with the dies, of an ejecting mecha` nism comprising a reciprocatory knock-out pin, mechanism actuated :trom a moving part of the machine -lior causing the knockout pin to press against the end ot a blank held in the dies, and mechanism for causn ing the knock-out pin to cject'a blank from the dies.

2. ln a metal heading machine the combination with the dies, of an ejecting mechanism comprising a reciprocatory knock-out pin, yielding mechanism actuated from a moving part of the machine tor causing the knock-out pin to press against the end of a blank held in the dies, and mechanism for causing the knock-out pin lto eject a blank from the dies.

3 in a metal heading machine the combination with the dies and means ttor closing the dies, or' an ejecting mechanism comprising` a reciprocatory knockout pin, yielding mechanism actuated trom the die closing means tor causing the kiiock-out pin to press against the end of a blank held in the dies, and mechanism-for causing the knockou pin to eject a blank from the dies.

4c. ln a metal heading machine the combination with the dies, of an ejecting mechanism comprising a reciprocatory knock-out pin, a plunger connected with the pin, a lever for reciprocating the plunger, a lever bearing against the plunger, and yielding means actuated from a moving part of the machine for causing the latter lever to press the plunger forward.

5. In a metal heading machine the combination with the dies, ot an ejecting mechanism comprising a reciprocatory knock-out pin, a. plunger connected with the pin, a lever tor reciprocating the plunger, a lever bearing against the plunger, and means including a plurality of springs actuated from a. moving part of the machine for causing the latter lever to press the plunger forward.

6. ln a metal heading machine the combination with the dies, of an ejecting mechanism comprising` a reciprocatory knock-out pin. a plunger connected with the pin, a lever tor reciprocating the plunger, a lever hearing against the plunger, and means including movable cage containing cushioning springs actuated. trein a moving part of the machine for causing the latter lever to press the plunger forward.

'7. ln a metal heading machine the combination with the dies and means for closing the dies, of an ejecting mechanism comprising a reciproca-tory knock-out pin, a plunger connected with the pin, a lever for reciprocating the plunger, a lever bearing against theplunger, and means including a cushion actuated from the die closing means for causing the latter lever to press the plunger forward.

8, ln a metal heading` machine the com-` bination with the dies and a toggle mechanism for closing the dies, ot ejecting mechareciprocating the plunger, a lever bearingy 'u against the plunger, a movable cage containing springs and, a disk pressed out-L wardly by said springs against said latter lever, and means actuated trom a moving part of the machine tor moving said cage and through said disk causing the latter lever to press the plunger forward.

i0. ln a metal heading machine the combination with the dies and a toggle mechanism for closing the dies, ot ejectingmechanism comprising a reciprocatory knock-out pin, a plunger connected with the pin,` a lever for reciprocating the plunger7 a lever bearing against the plunger, a movable cage containing springs and a disk pressed outwardly by said springs against said latter lever, and means actuated from said toggle mechanism for moving the cage and through said disk causing the latter lever to -press the plunger forward.

ll. In a metal heading machine the combination with the dies and mechanism for closing the dies, of ejecting mechanism comprising a reciprocatory knock-out pin, a lever for reciprocating the knock-out pin, a lever bearing against the plunger,k and means for causing the latter lever to press the plunger forward when the dii-es are closed.

12. ln a metal heading machine the combination with rthe dies, of means vtor ejecting a blank from the dies, yielding mechanism engaging the ejecting means and actuated to normally torce said means against a blank held in the dies, and mechanism operated independently ot and without interterence by said yielding mechanism for ejecting the blank from the dies.

HENRY L. SMITH. 

